SNVAA73 may   2023 LM53602 , LM53602-Q1 , LM53603-Q1 , LM63625-Q1 , LM63635-Q1 , LMR14020-Q1 , LMR14030-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2EMI Noise Caused by Instantaneous Switching
  6. 3Optimize Circuit and Layout Design
  7. 4Using a Boot Resistor
  8. 5Design Consideration on RBOOT
    1. 5.1 BT-SW UVLO
    2. 5.2 Refresh Boot Capacitor
    3. 5.3 Thermal
  9. 6Converter With Dedicated RBOOT Pin
  10. 7Summary
  11. 8References

3 Optimize Circuit and Layout Design

There are several methods to reduce the ringing to keep the MOSFET switches and controller pins within the safe operating region and EMI noise so caused, such as a boot resistor, a high-side gate resistor, or a RC snubber. However, the first approach is to optimize the circuit design, component selection and PCB layout to minimize the parasitic inductor and loop area of critical path. TI provides many supporting documents for how to optimize the circuit and layout design for lower EMI.

If the EMI levels of the buck converter circuit exceed requirement levels and layout or filtering can not be improved, then reduction of the buck converter switching speed by boot resistor can help reduce the EMI levels.